Removable embolus blood clot filter

摘要

A removable blood clot filter includes a number of locator members and anchor members disposed radially and extending angularly downward from a hub. The locator members include a number of linear portions having distinct axes configured to place a tip portion approximately parallel to the walls of a blood vessel when implanted and to apply sufficient force to the vessel walls to position the filter near the vessel centerline. The anchor members each include a hook configured to penetrate the vessel wall to prevent longitudinal movement due to blood flow. The hooks may have a cross section sized to allow for a larger radius of curvature under strain so that the filter can be removed without damaging the vessel wall.

主权项

1. A blood vessel filter, comprising:
a hub disposed along a longitudinal axis; a plurality of locator members projecting from the hub, a proximal end of each of the locator members attached to the hub, the locator members bounded by a first compound surface of revolution about the longitudinal axis, the first compound surface of revolution including a first frustum distal of the hub having a first volume, and a second frustum distal of the first frustum having a second volume greater than the first volume; and a plurality of anchor members projecting from the hub, a proximal end of each of the anchor members attached to the hub, the anchor members bounded by a second compound surface of revolution about the longitudinal axis, the second compound surface of revolution including a third frustum and a fourth frustum distal of the third frustum, wherein one of the plurality of locator members has a proximal segment, a first segment, a second segment that extends along a second angle of about 20 degrees with respect to the longitudinal axis; and a tip segment that extends along a third angle of less than about 1 degree with respect to the longitudinal axis.